%% trueR function : Calculates the true r value for N and the flip angle. 
% Mathematical derivation of equations can be found in 
% Yarnykh, MRM 57:192-200 (2007).   
%
%% Function Declaration
%
function [ r ] = trueR(trueN, trueAngle)
%% Calculate the cosine of the true flip angles.
%

r = (1+trueN*cos(trueAngle*pi/180))/(trueN+cos(trueAngle*pi/180)); % Assumes TR1,2 << T1 and 1-TR1,2 ~= 1.

